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nspawn: fix overlay with automatic temporary tree

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This makes --overlay=+/foobar::/foobar work again, i.e. where the middle
parameter is left out. According to the documentation this is supposed
to generate a temporary writable work place in the midle. But it
apparently never did. Weird.
This commit is contained in:
Lennart Poettering 2019-12-12 17:05:21 +01:00
parent be3e4467d4
commit d0556c55e7
1 changed files with 41 additions and 17 deletions
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58
src/nspawn/nspawn-mount.c
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@ -102,6 +102,30 @@ static char *resolve_source_path(const char *dest, const char *source) {
return strdup(source);
}
static int allocate_temporary_source(CustomMount *m) {
assert(m);
assert(!m->source);
assert(!m->rm_rf_tmpdir);
m->rm_rf_tmpdir = strdup("/var/tmp/nspawn-temp-XXXXXX");
if (!m->rm_rf_tmpdir)
return log_oom();
if (!mkdtemp(m->rm_rf_tmpdir)) {
m->rm_rf_tmpdir = mfree(m->rm_rf_tmpdir);
return log_error_errno(errno, "Failed to acquire temporary directory: %m");
}
m->source = path_join(m->rm_rf_tmpdir, "src");
if (!m->source)
return log_oom();
if (mkdir(m->source, 0755) < 0)
return log_error_errno(errno, "Failed to create %s: %m", m->source);
return 0;
}
int custom_mount_prepare_all(const char *dest, CustomMount *l, size_t n) {
size_t i;
int r;
@ -136,21 +160,9 @@ int custom_mount_prepare_all(const char *dest, CustomMount *l, size_t n) {
} else {
/* No source specified? In that case, use a throw-away temporary directory in /var/tmp */
m->rm_rf_tmpdir = strdup("/var/tmp/nspawn-temp-XXXXXX");
if (!m->rm_rf_tmpdir)
return log_oom();
if (!mkdtemp(m->rm_rf_tmpdir)) {
m->rm_rf_tmpdir = mfree(m->rm_rf_tmpdir);
return log_error_errno(errno, "Failed to acquire temporary directory: %m");
}
m->source = path_join(m->rm_rf_tmpdir, "src");
if (!m->source)
return log_oom();
if (mkdir(m->source, 0755) < 0)
return log_error_errno(errno, "Failed to create %s: %m", m->source);
r = allocate_temporary_source(m);
if (r < 0)
return r;
}
}
@ -167,6 +179,20 @@ int custom_mount_prepare_all(const char *dest, CustomMount *l, size_t n) {
free_and_replace(*j, s);
}
if (m->source) {
char *s;
s = resolve_source_path(dest, m->source);
if (!s)
return log_oom();
free_and_replace(m->source, s);
} else {
r = allocate_temporary_source(m);
if (r < 0)
return r;
}
if (m->work_dir) {
char *s;
@ -176,8 +202,6 @@ int custom_mount_prepare_all(const char *dest, CustomMount *l, size_t n) {
free_and_replace(m->work_dir, s);
} else {
assert(m->source);
r = tempfn_random(m->source, NULL, &m->work_dir);
if (r < 0)
return log_error_errno(r, "Failed to acquire working directory: %m");